Regenerative Thermal Oxidation Device is an efficient, energy-saving and environmentally friendly device for treating medium and high concentration organic waste gas. RTO regenerative thermal oxidizer oxidizes organic matter (VOCs) in waste gas into carbon dioxide and water at high temperature, thereby purifying waste gas and recovering the heat released when the waste gas is decomposed. The three-chamber RTO regenerative thermal oxidizer has a waste gas decomposition efficiency of more than 99% and a heat recovery efficiency of more than 95%, which can reduce operating costs.
The principle of Regenerative Thermal Oxidation Device is to heat the organic waste gas to above 760℃, so that the VOCs in the waste gas are oxidized and decomposed into carbon dioxide and water. The high-temperature gas generated by oxidation flows through a special ceramic thermal storage body, causing the ceramic body to heat up and "storage heat". This "heat storage" is used to preheat the organic waste gas that enters later. Thereby saving fuel consumption for heating the waste gas. The ceramic thermal storage body should be divided into two (including two) or more zones or chambers, and each thermal storage chamber undergoes the procedures of heat storage-heat release-cleaning in turn, over and over again, and works continuously. After the thermal storage chamber "releases heat", an appropriate amount of clean air should be introduced immediately to clean the thermal storage chamber (to ensure that the VOCs removal rate is above 95%). Only after the cleaning is completed can the "heat storage" procedure be entered.
Regenerative Thermal Oxidation Device process flow chart
Stage 1: The waste gas is preheated through the regenerative bed A and then enters the combustion chamber for combustion. The remaining untreated waste gas in the regenerative bed C is blown back to the combustion chamber for incineration (purge function). The decomposed waste gas is discharged through the regenerative bed B, and the regenerative bed B is heated.
Stage 2: The waste gas is preheated through the regenerative bed B and then enters the combustion chamber for combustion. The remaining untreated waste gas in the regenerative bed A is blown back to the combustion chamber for incineration. The decomposed waste gas is discharged through the regenerative bed C, and the regenerative bed C is heated.
Stage 3: The waste gas is preheated through the regenerative bed C and then enters the combustion chamber for combustion. The remaining untreated waste gas in the regenerative bed B is blown back to the combustion chamber for incineration. The decomposed waste gas is discharged through the regenerative bed A, and the regenerative bed A is heated.
In this cyclical operation, the exhaust gas is oxidized and decomposed in the combustion chamber, and the temperature in the combustion chamber is maintained at the set temperature (generally 800-850°C). When the exhaust gas concentration at the RTO inlet reaches a certain value, the heat released by the oxidation of VOCs can maintain the energy reserve of RTO heat storage and heat release. At this time, RTO can maintain the temperature in the combustion chamber without using fuel.
Regenerator, oxidation combustion chamber, switching valve, burner, gas and combustion-supporting system, compressed air system, control system, etc.
RTO regenerator
The RTO furnace body consists of two or more regenerators and a combustion chamber. The regenerators perform functions such as preheating, purging, and heat storage respectively, taking turns. The shell is made of 6mm carbon steel plate (surface sandblasted), with reinforced ribs on the outer surface. The shell is well sealed and the outer surface is coated with heat-resistant paint.
Combustion chamber and insulation
According to the requirements of the "Technical Specifications for Industrial Organic Waste Gas Treatment Engineering by Regenerative Combustion Method" HJ 1093-2020, the regenerative combustion device should be overall internally insulated, and the outer surface temperature should not be higher than 60°C. The combustion chamber shell is made of 6mm Q235B steel plate and reinforced with section steel. The insulation layer is made of ceramic fiber insulation with a thickness of about 250mm. It contains two layers of ceramic fiber felt and one layer of ceramic fiber modules. A heat-resistant steel frame is set inside the ceramic fiber module, which is fixed to the furnace shell with anchors and is temperature-resistant. The thermal insulation effect at 1260℃ is better than that of ordinary aluminum or high-purity fiber cotton.
Heat storage ceramics
The equipment uses heat storage ceramics made of dense cordierite material. Compared with ordinary ceramics, it has significant thermal shock resistance and low thermal expansion coefficient. It is more suitable for waste gas treatment under heat exchange conditions than common ceramics and other materials. . Features of MLM series ceramics:
1. MLM has good resistance to clogging;
2. Multi-layer ceramic plate module design, the heat storage ceramic does not have residual thermal stress after heating;
3. The pressure of air flow through MLM is reduced, reducing operating costs;
4. The air flow is evenly distributed, with high turbulence and high heat transfer efficiency;
5. The MLM is installed crosswise at 90 degrees to avoid the problem of pressure drop surge caused by installation misalignment. It has strong adaptability to on-site installation and the MLM is easy to maintain.
RTO combustion system
Using McKesson/North American industrial burners. The system includes combustion controller, flame detector, high-pressure igniter and corresponding valve combination. The high temperature sensor in the furnace can feedback the furnace temperature information and is used to control the heating capacity of the burner to stabilize the furnace temperature at around 800°C.
RTO air direction switching valve
All RTO wind direction switching valves adopt direct push cover valves. The valves have high precision, small leakage (≤1%), long life (up to 1 million times), rapid opening and closing (1s), and reliable operation. The actuator uses a pneumatic actuator, including a solenoid valve and a cylinder. The compressed air pressure of the pneumatic actuator is 0.4~0.6MPa.
RTO control system
This system adopts Siemens PLC programmable control. The system mainly consists of the regulating object (furnace temperature), detection component (temperature measuring instrument), regulator and actuator. The control cabinet is equipped with human-machine interface (HMI) equipment for on-site operation prompts, fault alarms, operating parameter display, control parameter setting and equipment control.
1. High-concentration waste gas treatment realizes self-heating combustion, low operating costs and reasonable cost performance;
2. High purification efficiency, three-chamber RTO can reach 99.5%;
3. Ceramic heat storage body is used as heat recovery, preheating and heat storage are operated alternately, and the thermal efficiency is ≥95%;
4. The furnace body steel structure is reliable, the insulation layer is thick, the operation is safe and reliable, and the stability is high;
5. PLC programmable automatic control, high degree of automation;
6. Wide applicability, can purify any organic waste gas;
7. Waste heat utilization, high economic benefits, excess heat energy is recycled to drying room, oven, etc., and the heating of the drying room does not consume additional fuel or electricity.
| Product model | THY-RTO10k | THY-RTO20k | THY-RTO30K | THY-RTO40k | THY-RTO50k | THY-RTO60k |
| Air volume treated (m³/h) | 10000 | 20000 | 30000 | 40000 | 50000 | 60000 |
| Exhaust gas concentration treated (mg/m³) | 100-3500mg/m³ (mixed gas) | |||||
| Working temperature (℃) | 700-870 | |||||
| Equipment pressure drop (Pa) | 2000-3000 | |||||
| Purification efficiency (%) | ≧97 | |||||
| Installed power (KW) | ≦20 | ≦30 | ≦50 | ≦60 | ≦70 | ≦80 |
| Fuel consumption (m³/h) | 10-15 | 18-25 | 32-38 | 40-47 | 50-60 | 70-80 |
| Adjustment ratio | 0-100% | |||||
| Remarks: 1. The above selection is for conventional processing standard design, other air volume specifications can be designed separately; actual parameters and models are subject to contract design parameters. | ||||||
It is used to treat medium and high concentration organic waste gas with large air volume generated by industries such as petroleum, chemical industry, plastics, rubber, pharmaceuticals, printing, furniture, textile printing and dyeing, coating, paint, semiconductor manufacturing, and synthetic materials. It can treat organic substances including benzene, phenols, aldehydes, ketones, ethers, esters, alcohols, alkanes, hydrocarbons, etc.
